
#include "app.h"

// BLE HANDLE / ADV  / DFU
static uint16_t                          m_conn_handle = BLE_CONN_HANDLE_INVALID;   /**< Handle of the current connection. */
static dm_application_instance_t         m_app_handle;                              /**< Application identifier allocated by device manager */

static ble_uuid_t m_adv_uuids[] = {{BLE_UUID_DEVICE_INFORMATION_SERVICE, BLE_UUID_TYPE_BLE}}; /**< Universally unique service identifiers. */

#ifdef BLE_DFU_APP_SUPPORT
static ble_dfu_t                         m_dfus;                                    /**< Structure used to identify the DFU service. */
#endif // BLE_DFU_APP_SUPPORT


// Scheduler settings
#define SCHED_MAX_EVENT_DATA_SIZE       32
#define SCHED_QUEUE_SIZE                10

// USER APP
#define START_STRING                    "Start...\n"                                /**< The string that will be sent over the UART when the application starts. */

struct user_ctx {
    struct flash_ctx_t flash_ctx;
    struct oled_ctx_t oled_ctx;
};

static uint32_t PIN = 1 << 28;
static app_timer_id_t user_app_timer;
static struct oled_ctx_t oled_ctx;
//static struct user_ctx g_ctx;
static struct flash_ctx_t flash_ctx;

static char scan_data[4] = {0};
static uint32_t incr_cnt = 0;

/**@brief Callback function for asserts in the SoftDevice.
 *
 * @details This function will be called in case of an assert in the SoftDevice.
 *
 * @warning This handler is an example only and does not fit a final product. You need to analyze
 *          how your product is supposed to react in case of Assert.
 * @warning On assert from the SoftDevice, the system can only recover on reset.
 *
 * @param[in] line_num   Line number of the failing ASSERT call.
 * @param[in] file_name  File name of the failing ASSERT call.
 */
void assert_nrf_callback(uint16_t line_num, const uint8_t * p_file_name)
{
    app_error_handler(DEAD_BEEF, line_num, p_file_name);
}

/**@brief Function for the GAP initialization.
 *
 * @details This function sets up all the necessary GAP (Generic Access Profile) parameters of the
 *          device including the device name, appearance, and the preferred connection parameters.
 */
static void gap_params_init(void)
{
    uint32_t                err_code;
    ble_gap_conn_params_t   gap_conn_params;
    ble_gap_conn_sec_mode_t sec_mode;

    BLE_GAP_CONN_SEC_MODE_SET_OPEN(&sec_mode);

    err_code = sd_ble_gap_device_name_set(&sec_mode,
                                          (const uint8_t *)DEVICE_NAME,
                                          strlen(DEVICE_NAME));
    APP_ERROR_CHECK(err_code);

    err_code = sd_ble_gap_appearance_set(BLE_APPEARANCE_HEART_RATE_SENSOR_HEART_RATE_BELT);
    APP_ERROR_CHECK(err_code);

    memset(&gap_conn_params, 0, sizeof(gap_conn_params));

    gap_conn_params.min_conn_interval = MIN_CONN_INTERVAL;
    gap_conn_params.max_conn_interval = MAX_CONN_INTERVAL;
    gap_conn_params.slave_latency     = SLAVE_LATENCY;
    gap_conn_params.conn_sup_timeout  = CONN_SUP_TIMEOUT;

    err_code = sd_ble_gap_ppcp_set(&gap_conn_params);
    APP_ERROR_CHECK(err_code);
}

#ifdef BLE_DFU_APP_SUPPORT
/**@brief Function for stopping advertising.
 */
static void advertising_stop(void)
{
    uint32_t err_code;

    err_code = sd_ble_gap_adv_stop();
    APP_ERROR_CHECK(err_code);

    err_code = bsp_indication_set(BSP_INDICATE_IDLE);
    APP_ERROR_CHECK(err_code);
}

/**@brief Function for loading application-specific context after establishing a secure connection.
 *
 * @details This function will load the application context and check if the ATT table is marked as
 *          changed. If the ATT table is marked as changed, a Service Changed Indication
 *          is sent to the peer if the Service Changed CCCD is set to indicate.
 *
 * @param[in] p_handle The Device Manager handle that identifies the connection for which the context
 *                     should be loaded.
 */
static void app_context_load(dm_handle_t const * p_handle)
{
    uint32_t                 err_code;
    static uint32_t          context_data;
    dm_application_context_t context;

    context.len    = sizeof(context_data);
    context.p_data = (uint8_t *)&context_data;

    err_code = dm_application_context_get(p_handle, &context);
    if (err_code == NRF_SUCCESS)
    {
        // Send Service Changed Indication if ATT table has changed.
        if ((context_data & (DFU_APP_ATT_TABLE_CHANGED << DFU_APP_ATT_TABLE_POS)) != 0)
        {
            err_code = sd_ble_gatts_service_changed(m_conn_handle, APP_SERVICE_HANDLE_START, BLE_HANDLE_MAX);
            if ((err_code != NRF_SUCCESS) &&
                (err_code != BLE_ERROR_INVALID_CONN_HANDLE) &&
                (err_code != NRF_ERROR_INVALID_STATE) &&
                (err_code != BLE_ERROR_NO_TX_PACKETS) &&
                (err_code != NRF_ERROR_BUSY) &&
                (err_code != BLE_ERROR_GATTS_SYS_ATTR_MISSING))
            {
                APP_ERROR_HANDLER(err_code);
            }
        }

        err_code = dm_application_context_delete(p_handle);
        APP_ERROR_CHECK(err_code);
    }
    else if (err_code == DM_NO_APP_CONTEXT)
    {
        // No context available. Ignore.
    }
    else
    {
        APP_ERROR_HANDLER(err_code);
    }
}

/** @snippet [DFU BLE Reset prepare] */
/**@brief Function for preparing for system reset.
 *
 * @details This function implements @ref dfu_app_reset_prepare_t. It will be called by
 *          @ref dfu_app_handler.c before entering the bootloader/DFU.
 *          This allows the current running application to shut down gracefully.
 */
static void reset_prepare(void)
{
    uint32_t err_code;

    if (m_conn_handle != BLE_CONN_HANDLE_INVALID)
    {
        // Disconnect from peer.
        err_code = sd_ble_gap_disconnect(m_conn_handle, BLE_HCI_REMOTE_USER_TERMINATED_CONNECTION);
        APP_ERROR_CHECK(err_code);
        err_code = bsp_indication_set(BSP_INDICATE_IDLE);
        APP_ERROR_CHECK(err_code);
    }
    else
    {
        // If not connected, the device will be advertising. Hence stop the advertising.
        advertising_stop();
    }

    err_code = ble_conn_params_stop();
    APP_ERROR_CHECK(err_code);

    nrf_delay_ms(500);
}
/** @snippet [DFU BLE Reset prepare] */
#endif // BLE_DFU_APP_SUPPORT

/**@brief Function for initializing services that will be used by the application.
 *
 * @details Initialize the Heart Rate, Battery and Device Information services.
 */
static void services_init(void)
{
    uint32_t       err_code;
    ble_dis_init_t dis_init;

    // Initialize Device Information Service.
    memset(&dis_init, 0, sizeof(dis_init));

    ble_srv_ascii_to_utf8(&dis_init.manufact_name_str, (char *)MANUFACTURER_NAME);
    ble_srv_ascii_to_utf8(&dis_init.model_num_str, (char *)MANUFACTURER_NAME);

    BLE_GAP_CONN_SEC_MODE_SET_OPEN(&dis_init.dis_attr_md.read_perm);
    BLE_GAP_CONN_SEC_MODE_SET_NO_ACCESS(&dis_init.dis_attr_md.write_perm);

    err_code = ble_dis_init(&dis_init);
    APP_ERROR_CHECK(err_code);

#ifdef BLE_DFU_APP_SUPPORT
    /** @snippet [DFU BLE Service initialization] */
    ble_dfu_init_t   dfus_init;

    // Initialize the Device Firmware Update Service.
    memset(&dfus_init, 0, sizeof(dfus_init));

    dfus_init.evt_handler   = dfu_app_on_dfu_evt;
    dfus_init.error_handler = NULL;
    dfus_init.evt_handler   = dfu_app_on_dfu_evt;
    dfus_init.revision      = DFU_REVISION;

    err_code = ble_dfu_init(&m_dfus, &dfus_init);
    APP_ERROR_CHECK(err_code);

    dfu_app_reset_prepare_set(reset_prepare);
    dfu_app_dm_appl_instance_set(m_app_handle);
    /** @snippet [DFU BLE Service initialization] */
#endif // BLE_DFU_APP_SUPPORT
}

/**@brief Function for handling the Connection Parameters Module.
 *
 * @details This function will be called for all events in the Connection Parameters Module which
 *          are passed to the application.
 *          @note All this function does is to disconnect. This could have been done by simply
 *                setting the disconnect_on_fail config parameter, but instead we use the event
 *                handler mechanism to demonstrate its use.
 *
 * @param[in] p_evt  Event received from the Connection Parameters Module.
 */
static void on_conn_params_evt(ble_conn_params_evt_t * p_evt)
{
    uint32_t err_code;

    if (p_evt->evt_type == BLE_CONN_PARAMS_EVT_FAILED)
    {
        err_code = sd_ble_gap_disconnect(m_conn_handle, BLE_HCI_CONN_INTERVAL_UNACCEPTABLE);
        APP_ERROR_CHECK(err_code);
    }
}

/**@brief Function for handling a Connection Parameters error.
 *
 * @param[in] nrf_error  Error code containing information about what went wrong.
 */
static void conn_params_error_handler(uint32_t nrf_error)
{
    APP_ERROR_HANDLER(nrf_error);
}

/**@brief Function for initializing the Connection Parameters module.
 */
static void conn_params_init(void)
{
    uint32_t               err_code;
    ble_conn_params_init_t cp_init;

    memset(&cp_init, 0, sizeof(cp_init));

    cp_init.p_conn_params                  = NULL;
    cp_init.first_conn_params_update_delay = FIRST_CONN_PARAMS_UPDATE_DELAY;
    cp_init.next_conn_params_update_delay  = NEXT_CONN_PARAMS_UPDATE_DELAY;
    cp_init.max_conn_params_update_count   = MAX_CONN_PARAMS_UPDATE_COUNT;
//    cp_init.start_on_notify_cccd_handle    = m_hrs.hrm_handles.cccd_handle;
    cp_init.start_on_notify_cccd_handle    = BLE_GATT_HANDLE_INVALID;
    cp_init.disconnect_on_fail             = false;
    cp_init.evt_handler                    = on_conn_params_evt;
    cp_init.error_handler                  = conn_params_error_handler;

    err_code = ble_conn_params_init(&cp_init);
    APP_ERROR_CHECK(err_code);
}

/**@brief Function for putting the chip into sleep mode.
 *
 * @note This function will not return.
 */
static void sleep_mode_enter(void)
{
    uint32_t err_code = bsp_indication_set(BSP_INDICATE_IDLE);
    APP_ERROR_CHECK(err_code);

    // Prepare wakeup buttons.
    err_code = bsp_btn_ble_sleep_mode_prepare();
    APP_ERROR_CHECK(err_code);

    // Go to system-off mode (this function will not return; wakeup will cause a reset).
    err_code = sd_power_system_off();
    APP_ERROR_CHECK(err_code);
}

/**@brief Function for handling advertising events.
 *
 * @details This function will be called for advertising events which are passed to the application.
 *
 * @param[in] ble_adv_evt  Advertising event.
 */
static void on_adv_evt(ble_adv_evt_t ble_adv_evt)
{
    uint32_t err_code;

    switch (ble_adv_evt)
    {
        case BLE_ADV_EVT_FAST:
            err_code = bsp_indication_set(BSP_INDICATE_ADVERTISING);
            APP_ERROR_CHECK(err_code);
            break;
        case BLE_ADV_EVT_IDLE:
            sleep_mode_enter();
            break;
        default:
            break;
    }
}

/**@brief Function for handling the Application's BLE Stack events.
 *
 * @param[in] p_ble_evt  Bluetooth stack event.
 */
static void on_ble_evt(ble_evt_t * p_ble_evt)
{
    uint32_t err_code;

    switch (p_ble_evt->header.evt_id)
            {
        case BLE_GAP_EVT_CONNECTED:
            err_code = bsp_indication_set(BSP_INDICATE_CONNECTED);
            APP_ERROR_CHECK(err_code);
            m_conn_handle = p_ble_evt->evt.gap_evt.conn_handle;

            user_on_ble_connected();
            break;

        case BLE_GAP_EVT_DISCONNECTED:
            m_conn_handle = BLE_CONN_HANDLE_INVALID;
            user_on_ble_disconnected();
            break;

        default:
            // No implementation needed.
            break;
    }
}

/**@brief Function for dispatching a BLE stack event to all modules with a BLE stack event handler.
 *
 * @details This function is called from the BLE Stack event interrupt handler after a BLE stack
 *          event has been received.
 *
 * @param[in] p_ble_evt  Bluetooth stack event.
 */
static void ble_evt_dispatch(ble_evt_t * p_ble_evt)
{
    dm_ble_evt_handler(p_ble_evt);
    ble_conn_params_on_ble_evt(p_ble_evt);
    bsp_btn_ble_on_ble_evt(p_ble_evt);
#ifdef BLE_DFU_APP_SUPPORT
    /** @snippet [Propagating BLE Stack events to DFU Service] */
    ble_dfu_on_ble_evt(&m_dfus, p_ble_evt);
    /** @snippet [Propagating BLE Stack events to DFU Service] */
#endif // BLE_DFU_APP_SUPPORT
    on_ble_evt(p_ble_evt);
    ble_advertising_on_ble_evt(p_ble_evt);
}

/**@brief Function for dispatching a system event to interested modules.
 *
 * @details This function is called from the System event interrupt handler after a system
 *          event has been received.
 *
 * @param[in] sys_evt  System stack event.
 */
static void sys_evt_dispatch(uint32_t sys_evt)
{
    pstorage_sys_event_handler(sys_evt);
	fs_sys_event_handler(sys_evt);
    ble_advertising_on_sys_evt(sys_evt);
}

/**@brief Function for initializing the BLE stack.
 *
 * @details Initializes the SoftDevice and the BLE event interrupt.
 */
static void ble_stack_init(void)
{
    uint32_t err_code;

    nrf_clock_lf_cfg_t clock_lf_cfg = NRF_CLOCK_LFCLKSRC;

    // Initialize the SoftDevice handler module.
    SOFTDEVICE_HANDLER_INIT(&clock_lf_cfg, NULL);

    ble_enable_params_t ble_enable_params;
    err_code = softdevice_enable_get_default_config(CENTRAL_LINK_COUNT,
                                                    PERIPHERAL_LINK_COUNT,
                                                    &ble_enable_params);
    APP_ERROR_CHECK(err_code);

#ifdef BLE_DFU_APP_SUPPORT
    ble_enable_params.gatts_enable_params.service_changed = 1;
#endif // BLE_DFU_APP_SUPPORT
    //Check the ram settings against the used number of links
    CHECK_RAM_START_ADDR(CENTRAL_LINK_COUNT,PERIPHERAL_LINK_COUNT);

    // Enable BLE stack.
    err_code = softdevice_enable(&ble_enable_params);
    APP_ERROR_CHECK(err_code);

    // Register with the SoftDevice handler module for BLE events.
    err_code = softdevice_ble_evt_handler_set(ble_evt_dispatch);
    APP_ERROR_CHECK(err_code);

    // Register with the SoftDevice handler module for BLE events.
    err_code = softdevice_sys_evt_handler_set(sys_evt_dispatch);
    APP_ERROR_CHECK(err_code);
}

/**@brief Function for handling events from the BSP module.
 *
 * @param[in]   event   Event generated by button press.
 */
void bsp_event_handler(bsp_event_t event)
{
    uint32_t err_code;
    switch (event)
    {
		// 进入睡眠模式
        case BSP_EVENT_SLEEP:
			printf("bsp_event_sleep\n");
            sleep_mode_enter();
            break;

		// 按键长按，关闭连接
        case BSP_EVENT_DISCONNECT:
			printf("disconnected\n");
            err_code = sd_ble_gap_disconnect(m_conn_handle, BLE_HCI_REMOTE_USER_TERMINATED_CONNECTION);
            if (err_code != NRF_ERROR_INVALID_STATE)
            {
                APP_ERROR_CHECK(err_code);
            }
            break;

        case BSP_EVENT_WHITELIST_OFF:
            err_code = ble_advertising_restart_without_whitelist();
            if (err_code != NRF_ERROR_INVALID_STATE)
            {
                APP_ERROR_CHECK(err_code);
            }
            break;

        default:
            break;
    }
}

/**@brief Function for initializing the Advertising functionality.
 */
static void advertising_init(void)
{
    uint32_t      err_code;
    ble_advdata_t advdata;
	ble_advdata_t scanrsp;
	ble_advdata_manuf_data_t        manuf_data, manuf_scan;

	// Build advertising data struct to pass into @ref ble_advertising_init.
	memset(&advdata, 0, sizeof(advdata));
	memset(&manuf_data, 0, sizeof(manuf_data));

	memset(&scanrsp, 0, sizeof(scanrsp));
	memset(&manuf_scan, 0, sizeof(manuf_scan));

	manuf_data.company_identifier	= 0x0059; // Nordics company ID
	manuf_data.data.p_data			= (uint8_t *)scan_data;
	manuf_data.data.size			= sizeof(scan_data);

	advdata.name_type               = BLE_ADVDATA_FULL_NAME;
	advdata.include_appearance      = false;
	advdata.flags                   = BLE_GAP_ADV_FLAGS_LE_ONLY_GENERAL_DISC_MODE;
	advdata.uuids_complete.uuid_cnt = sizeof(m_adv_uuids) / sizeof(m_adv_uuids[0]);
	advdata.uuids_complete.p_uuids  = m_adv_uuids;
	advdata.p_manuf_specific_data	= &manuf_data;
	/*
	 * what is advertising mode?.
	 */

	manuf_scan.company_identifier	= 0x0059;
	manuf_scan.data.p_data			= (uint8_t *)scan_data;
	manuf_scan.data.size			= sizeof(scan_data);

	scanrsp.name_type				= BLE_ADVDATA_NO_NAME;
	scanrsp.p_manuf_specific_data	= &manuf_scan;

	ble_adv_modes_config_t options = {0};
	options.ble_adv_fast_enabled  = BLE_ADV_FAST_ENABLED;
	options.ble_adv_fast_interval = APP_ADV_INTERVAL;
	options.ble_adv_fast_timeout  = APP_ADV_TIMEOUT_IN_SECONDS;

	err_code = ble_advertising_init(&advdata, &scanrsp, &options, on_adv_evt, NULL);
	APP_ERROR_CHECK(err_code);
}

/**@brief Function for handling the Device Manager events.
 *
 * @param[in] p_evt  Data associated to the device manager event.
 */
static uint32_t device_manager_evt_handler(dm_handle_t const * p_handle,
		dm_event_t const  * p_event,
		ret_code_t        event_result)
{
	APP_ERROR_CHECK(event_result);

#ifdef BLE_DFU_APP_SUPPORT
	if (p_event->event_id == DM_EVT_LINK_SECURED)
	{
		app_context_load(p_handle);
	}
#endif // BLE_DFU_APP_SUPPORT

	return NRF_SUCCESS;
}

/**@brief Function for the Device Manager initialization.
 *
 * @param[in] erase_bonds  Indicates whether bonding information should be cleared from
 *                         persistent storage during initialization of the Device Manager.
 */
static void device_manager_init(bool erase_bonds)
{
	uint32_t               err_code;
	dm_init_param_t        init_param = {.clear_persistent_data = erase_bonds};
	dm_application_param_t register_param;

	// Initialize persistent storage module.
	err_code = pstorage_init();
	APP_ERROR_CHECK(err_code);

	err_code = dm_init(&init_param);
	APP_ERROR_CHECK(err_code);

	memset(&register_param.sec_param, 0, sizeof(ble_gap_sec_params_t));

	register_param.sec_param.bond         = SEC_PARAM_BOND;
	register_param.sec_param.mitm         = SEC_PARAM_MITM;
	register_param.sec_param.lesc         = SEC_PARAM_LESC;
	register_param.sec_param.keypress     = SEC_PARAM_KEYPRESS;
	register_param.sec_param.io_caps      = SEC_PARAM_IO_CAPABILITIES;
	register_param.sec_param.oob          = SEC_PARAM_OOB;
	register_param.sec_param.min_key_size = SEC_PARAM_MIN_KEY_SIZE;
	register_param.sec_param.max_key_size = SEC_PARAM_MAX_KEY_SIZE;
	register_param.evt_handler            = device_manager_evt_handler;
	register_param.service_type           = DM_PROTOCOL_CNTXT_GATT_SRVR_ID;

	err_code = dm_register(&m_app_handle, &register_param);
	APP_ERROR_CHECK(err_code);
}

static void power_manage(void)
{
	uint32_t err_code = sd_app_evt_wait();
	APP_ERROR_CHECK(err_code);
}

enum BLE_CONN_STATUS user_ble_get_status() {
    return oled_ctx.conn_status;
}

void user_ble_set_status(enum BLE_CONN_STATUS status) {
    oled_ctx.conn_status = status;
}

void user_on_ble_connected() {
    user_ble_set_status(BLE_STATUS_CONNECTED);
}

void user_on_ble_disconnected() {
    user_ble_set_status(BLE_STATUS_DISCONNECTED);
}


// XXX 找到开始发广播或者扫描响应的，也要设置need_refresh
void user_app_oled() {
    uint8_t voltage;
    uint16_t adc_sample;
    static volatile int mark = 1;
    if(oled_ctx.enable_display) {
        if(oled_ctx.need_refresh) {

	        ssd1306_clear_display();

            enum BLE_CONN_STATUS status = user_ble_get_status();
            if(status == BLE_STATUS_CONNECTED )
	            oled_draw_ble();
            else if(status == BLE_STATUS_CONNECTING && mark ) {
	            oled_draw_ble();
            }
            mark = !mark;

	        adc_sample = user_get_adc();
            oled_ctx.cur_adc = adc_sample;
            oled_draw_adc(adc_sample);

            voltage = user_get_battery();
            oled_ctx.voltage = voltage;
            oled_draw_battery(voltage);

            ssd1306_display();

            oled_ctx.need_refresh = 0;
            nrf_delay_ms(0);
        }
    }
}

void user_app_flash() {

    int8_t flash_id = meta_info.flash_buffer_id;
    if(flash_id != -1) {
        printf("write flash id %d\n", flash_id);
        if(flash_id != 0 && flash_id != 1) {
            return;
        }

        struct data_block *data = &data_double_buffer[flash_id];
        uint32_t block_id = meta_info.data_block_curr_id;
        printf("write block id %d\n", block_id);
        flash_write_page(&flash_ctx, block_id, (void *)data, sizeof(struct data_block));
        flash_init_data_info(data, 0, 1);
        while(flash_check_busy(&flash_ctx));

        flash_write_page(&flash_ctx, META_BLOCK_ID, (void *)&meta_info, sizeof(struct meta_block));
        meta_info.data_block_curr_id ++;
        if(meta_info.data_block_curr_id >= NUM_PAGES) {
            meta_info.data_block_curr_id = DATA_BLOCK_START_ID;
        }
        meta_info.flash_buffer_id = -1;
        printf("meta block id %d\n", meta_info.meta_block_id);
    }
}

void user_app_ble_adv() {

}

void user_app_handler(void *p_context) {

    uint16_t adc_sample;
    uint8_t voltage;

	user_start_adc();

    voltage = user_get_battery();
    if(voltage != oled_ctx.voltage) {
        oled_ctx.need_refresh = 1;
    }

	adc_sample= user_get_adc();
    if(adc_sample != oled_ctx.cur_adc) {
        oled_ctx.need_refresh = 1;
    }

    {
        // flash
        struct data_block *dblock = get_curr_data_block();
        dblock->data[dblock->idx ++] = adc_sample >> 2;
        dblock->cnt++;

        if(dblock->cnt >= PAGE_DATA_SIZE) { // 240
            change_adc_buffer_id();
        }
        printf("%d %d %d %d\n", meta_info.adc_buffer_id, meta_info.flash_buffer_id, dblock->cnt, PAGE_DATA_SIZE);
        struct meta_block *meta = &meta_info;
        printf("%X %d %d %d %d\n", meta->magic, meta->meta_block_id,
                meta->data_block_start_id, meta->data_block_curr_id,
                meta->data_block_total_count);
    }

    {
        uint16_t len = sizeof(scan_data);
        uint32_t *buf = (uint32_t *)(scan_data + len - 4);
        *buf = incr_cnt ++;
        advertising_init();
    }

    printf("battery: %d, sizeof block %d size of meta %d\n", adc_sample, sizeof(struct data_block), sizeof(meta_info));
}

void user_app_init() {

	uart_init();
	user_oled_init();
	user_adc_init();

	memset(&oled_ctx, 0, sizeof(oled_ctx));
    oled_ctx.enable_display = 1;


    flash_init_ctx(&flash_ctx, SPI_INSTANCE);

    flash_init_meta_info(&flash_ctx, (uint8_t *)&meta_info, sizeof(meta_info));

    flash_init_data_info(&data_double_buffer[0], 0, 1);
    flash_init_data_info(&data_double_buffer[1], 0, 1);
    printf("%s", START_STRING);

    // need to reinit init_ctx

	APP_TIMER_DEF(user_app_timer);
	app_timer_create(&user_app_timer, APP_TIMER_MODE_REPEATED, user_app_handler);
	app_timer_start(user_app_timer,  APP_TIMER_TICKS(1000, 0), NULL);
    (void)(user_app_timer);
}

int main(void)
{
	uint32_t err_code;
	bool erase_bonds = false;

	// Initialize.
	app_trace_init();
	APP_SCHED_INIT(SCHED_MAX_EVENT_DATA_SIZE, SCHED_QUEUE_SIZE);
	APP_TIMER_APPSH_INIT(APP_TIMER_PRESCALER, APP_TIMER_OP_QUEUE_SIZE, true);

	user_app_init();

	ble_stack_init();
	device_manager_init(erase_bonds); // device_manager会让app识别出该外围设备支持dfu
	gap_params_init();
	advertising_init();
	services_init();
	conn_params_init();

	err_code = ble_advertising_start(BLE_ADV_MODE_FAST);
	APP_ERROR_CHECK(err_code);

    user_ble_set_status(BLE_STATUS_CONNECTING);

    nrf_gpio_cfg_output(28);
    LEDS_ON(PIN);

	// Enter main loop.
	for (;;)
	{
		app_sched_execute();

        user_app_flash();
        user_app_ble_adv();
        user_app_oled();

		power_manage();
	}
}

